A European plant (Allium sativum var. ophioscordon) having a garliclike bulb.
The bulb of this plant used as a seasoning.
[French, from German Rockenbolle : Rocken, distaff (from Middle High German rocke, from Old High German rocko, from Vulgar Latin *rotica, from Latin rotāre, to turn; see rotate) + Bolle, bulb (from Middle High German bolle, from Old High German bolla, ball; see bhel-2 in Indo-European roots).]